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It depends what kind of experiment you do. For some you just need one. For others you may change two variables. In most cases you only change one
There are 3 different variable. The independent variable is what you will be changing in the experiment and there should only be one. The dependent variable is what you will be measuring or observing. The controlled variable is what you will be keeping the same and there can be more than one. There is no limit on how many controlled variables you can have.
1.) List the needed materials. 2.) Plan the variables. 3.) List the procedures.
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It depends what kind of experiment you do. For some you just need one. For others you may change two variables. In most cases you only change one
In an experiment containing a number of possible variables only one of these should be altered in each individual experiment. Otherwise it is not possible to determine which variable is responsible for a particular change.
A experiment should only have one variable.
There are 3 different variable. The independent variable is what you will be changing in the experiment and there should only be one. The dependent variable is what you will be measuring or observing. The controlled variable is what you will be keeping the same and there can be more than one. There is no limit on how many controlled variables you can have.
1.) List the needed materials. 2.) Plan the variables. 3.) List the procedures.
To eliminate confounding variables, or variables that were not controlled and damaged the validity of the experiment by affecting the dependent and independent variable, the experimenter should plan ahead. They should run many checks before actually running an experiment.
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Yes, you should always be sterile before performing any experiment as to not add any variables.
All variables except for the independent and dependent variables should be kept the same. The other two will be changed by a fixed amount and by an unknown amount to be discovered during the experiment, respectively.
The scientific method that should be done throughout an experiment is to state the problem.